Role of theg9/2neutron orbital in the structure ofZn

Abstract

Measurements of p-ray singles and pp-coincidence spectra, p-ray angular distributions, and Doppler shift attenuation have been made, following the reaction Cu( He,pa) Zn at 30 MeV. The level scheme has been con6rmed up to 5773 keV. The spins and parities of the three states at 3227.6, 3785.7, and 4938.0 keV, hitherto uncertain or unknown, are found to be 17/2+, 17/2+, and 21/2+, respectively. The mean lives for these states, for which there is no information available in the literature, have been estimated, and the deduced B(Z2) values for the 4938.0-+ 3227.6 (21/2+~17/2+), 3227.6 m 2053.5 (17/2+ -+ 13/2+), and 3785.7 -+ 2053.5 (17/2+~13/2+) keV transitions are all found to be strongly enhanced with respect to the Weisskopf single-particle estimates indicating collectivity in the structure of the concerned states. Evidence is presented in favor of the interpretation of the positive parity states in Zn with J value 9/2+ to 21/2+, as arising from the weak coupling of a g9/2 neutron to the quadrupole excitations of the Zn core.

High spin rotational bands in 65Zn

“…This work confirms almost all the states reported in earlier experiment [6], which had used « induced reactions to populate the nucleus. In our study, a total of 21 previously unreported states structure of Zn in the framework of cranking model with the Woods-Saxon potential, the results of which will be published shortly.…”

“…This data establishes transitions at 1074, 1155, 1227, and 1349 keV which form the upper part of the ¾ band structure. The -ray at 1072 keV was observed previously[6] but the doublet partner 1074 keV was not resolved due to poor resolution of the detectors used. The measured DCO ratios for the 835, 988, 1074, 1155, 1173, 1227, 1349 and 1708 keV transitions are consistent with stretched E2 transitions.…”

“…The low-spin structure of the odd-nucleus Zn has been studied previously using both alpha induced reactions [5,6] and various transfer reactions [7][8][9]. No heavy-ion induced reaction has been attempted to explore the high-spin states for this nucleus.…”

“…No heavy-ion induced reaction has been attempted to explore the high-spin states for this nucleus. The most recent attempt to describe the structure of its low-lying levels [6] concluded that the first positive parity level, the  = 9/2 · state at 1.065 MeV, can be interpreted as more than 90% of a ¾ quasineutron coupled to a zero phonon excitation. Moreover, with an alpha projectile they could only populate up to the state at 5.769 MeV with no spin-parity assignment.…”

Detection of Cryptococcus by conventional, serological and molecular methods

“…Cryptococcus neoformans causes pulmonary infection and meningoencephalitis. The rising incidence of cryptococcosis in India is posing a serious threat (Banerjee et al, 1994(Banerjee et al, , 2001(Banerjee et al, , 2004Banerjee, 2005;Chakrabarti & Gupta, 1997;Chakrabarti et al, 2000). With the onset of AIDS, its occurrence has escalated manyfold (Currie & Casadevall, 1994).…”